Briar, The Restrained Hunger

Once per turn you may pay 3 Life:
Briar gains Haste and Lifelink until end of turn.
Put a +1/+1 counter on her.

Briar must attack each combat if able.

When Briar dies, return it to the battlefield transformed under its owner's control.

We don't have to fight ... You could just ...
Share your blood.